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after university lecturer Prof. Dr. Henche Rheinfelden natural size in synthetic material. The model is made of a smooth cutaneous and muscular cover in which the bones of the knee-joint are embedded. The anterior outer cover has four access points to the articular internal area two lateral one central and one medial opening. Moreover the arthroscopy model has one lateral and one medial access to the posterior recess. The Hoffa's fat body is shown and can be taken off and replaced by an adhesive catch. The internal and external menisci are anchored by plug-in threads and can be easily exchanged and replaced. The ligamentous apparatus i.e. the lateral ligaments and the cruciate ligaments are represented nearly true-to-nature. An easy exchange of the ligaments is possible because of the screw and plug-in joints. The patellar ligament is shown and the patella can be exchanged. After removal of the cutaneous-muscular covers one can use the bones with the ligaments as a functional knee-joint model. The mounting support at the thigh is suitable for mounting in an operating vice. The cutaneous and muscular covers are kept in place by four synthetic screws.